Yes, our licenses allow you to use the theme on multiple websites/domains. Currently there is no
WPML bridge plugin available for Vantage. The plugin developers and our team are still working on these. If you try using the WPML plugin without the bridge, then it simply doesn't work correctly.. items are not translated etc. Ultimately it would be up to you to make your own modifications to make it work if you intended to use the plugin without the available bridge plugin at this time. Thanks.